2 Pack Mini Digital Voltmeter 0.28" LED Display DC 2.4-30V Measuring Range Two Wire Voltage Tester Reverse Polarity Protection and Accurate Pressure Measurement

Specification: 2 x Mini Voltage Tester (Blue, Red) stable performance and high precision. When the voltage is less than 10V, the resolution is 0.01V. The voltage resolution above 10V is 0.1V. small and lightweight. Reverse polarity protection and 2 wire digital voltmeter, easy to install and connect. reverse polarity protection, the meter does not burn when reverse polarity is applied, but the screen does not show anything. the screw on the back can be adjusted for calibration. Turn clockwise to lower the tension.